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Patch ID: 3260500 - Query extension string only once

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This commit is contained in:
Nigel Stewart 2011-03-30 11:38:25 -05:00
parent 4a9b2a7b42
commit 1b38b41837
5 changed files with 71 additions and 48 deletions
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2
auto/bin/make_list.pl
View File

@ -46,7 +46,7 @@ if (@ARGV)
if (length($extstring))
{
print " CONST_CAST(" . $extvar . ") = " . $extpre . "GetExtension(\"$extstring\");\n";
print " CONST_CAST(" . $extvar . ") = _glewSearchExtension(\"$extstring\", start, end);\n";
}
if (keys %$functions)

20
auto/src/glew_head.c
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@ -217,3 +217,23 @@ static GLboolean _glewStrSame3 (GLubyte** a, GLuint* na, const GLubyte* b, GLuin
}
return GL_FALSE;
}
/*
* Search for name in the extensions string. Use of strstr()
* is not sufficient because extension names can be prefixes of
* other extension names. Could use strtok() but the constant
* string returned by glGetString might be in read-only memory.
*/
static GLboolean _glewSearchExtension (const char* name, const GLubyte *start, const GLubyte *end)
{
const GLubyte* p;
GLuint len = _glewStrLen((const GLubyte*)name);
p = start;
while (p < end)
{
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
p += n+1;
}
return GL_FALSE;
}

35
auto/src/glew_init_gl.c
View File

@ -1,26 +1,14 @@
/* ------------------------------------------------------------------------- */
/*
* Search for name in the extensions string. Use of strstr()
* is not sufficient because extension names can be prefixes of
* other extension names. Could use strtok() but the constant
* string returned by glGetString might be in read-only memory.
*/
GLboolean glewGetExtension (const char* name)
{
GLubyte* p;
GLubyte* end;
GLuint len = _glewStrLen((const GLubyte*)name);
p = (GLubyte*)glGetString(GL_EXTENSIONS);
if (0 == p) return GL_FALSE;
end = p + _glewStrLen(p);
while (p < end)
{
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
p += n+1;
}
return GL_FALSE;
const GLubyte* start;
const GLubyte* end;
start = (const GLubyte*)glGetString(GL_EXTENSIONS);
if (start == 0)
return GL_FALSE;
end = start + _glewStrLen(start);
return _glewSearchExtension(name, start, end);
}
/* ------------------------------------------------------------------------- */
@ -33,6 +21,8 @@ GLenum glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
const GLubyte* s;
GLuint dot;
GLint major, minor;
const GLubyte* start;
const GLubyte* end;
/* query opengl version */
s = glGetString(GL_VERSION);
dot = _glewStrCLen(s, '.');
@ -69,4 +59,11 @@ GLenum glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
CONST_CAST(GLEW_VERSION_1_2) = GLEW_VERSION_1_2_1 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_1_1) = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
}
/* query opengl extensions string */
start = glGetString(GL_EXTENSIONS);
if (start == 0)
start = (const GLubyte*)"";
end = start + _glewStrLen(start);
/* initialize extensions */

29
auto/src/glew_init_glx.c
View File

@ -2,27 +2,21 @@
GLboolean glxewGetExtension (const char* name)
{
GLubyte* p;
GLubyte* end;
GLuint len;
const GLubyte* start;
const GLubyte* end;
if (glXGetCurrentDisplay == NULL) return GL_FALSE;
len = _glewStrLen((const GLubyte*)name);
p = (GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
if (0 == p) return GL_FALSE;
end = p + _glewStrLen(p);
while (p < end)
{
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
p += n+1;
}
return GL_FALSE;
start = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
if (0 == start) return GL_FALSE;
end = start + _glewStrLen(start);
return _glewSearchExtension(name, start, end);
}
GLenum glxewContextInit (GLXEW_CONTEXT_ARG_DEF_LIST)
{
int major, minor;
const GLubyte* start;
const GLubyte* end;
/* initialize core GLX 1.2 */
if (_glewInit_GLX_VERSION_1_2(GLEW_CONTEXT_ARG_VAR_INIT)) return GLEW_ERROR_GLX_VERSION_11_ONLY;
/* initialize flags */
@ -49,4 +43,11 @@ GLenum glxewContextInit (GLXEW_CONTEXT_ARG_DEF_LIST)
break;
}
}
/* query GLX extension string */
start = 0;
if (glXGetCurrentDisplay != NULL)
start = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
if (start == 0)
start = (const GLubyte *)"";
end = start + _glewStrLen(start);
/* initialize extensions */

33
auto/src/glew_init_wgl.c
View File

@ -5,32 +5,37 @@ static PFNWGLGETEXTENSIONSSTRINGEXTPROC _wglewGetExtensionsStringEXT = NULL;
GLboolean wglewGetExtension (const char* name)
{
GLubyte* p;
GLubyte* end;
GLuint len = _glewStrLen((const GLubyte*)name);
const GLubyte* start;
const GLubyte* end;
if (_wglewGetExtensionsStringARB == NULL)
if (_wglewGetExtensionsStringEXT == NULL)
return GL_FALSE;
else
p = (GLubyte*)_wglewGetExtensionsStringEXT();
start = (const GLubyte*)_wglewGetExtensionsStringEXT();
else
p = (GLubyte*)_wglewGetExtensionsStringARB(wglGetCurrentDC());
if (0 == p) return GL_FALSE;
end = p + _glewStrLen(p);
while (p < end)
{
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
p += n+1;
}
return GL_FALSE;
start = (const GLubyte*)_wglewGetExtensionsStringARB(wglGetCurrentDC());
if (start == 0)
return GL_FALSE;
end = start + _glewStrLen(start);
return _glewSearchExtension(name, start, end);
}
GLenum wglewContextInit (WGLEW_CONTEXT_ARG_DEF_LIST)
{
GLboolean crippled;
const GLubyte* start;
const GLubyte* end;
/* find wgl extension string query functions */
_wglewGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)glewGetProcAddress((const GLubyte*)"wglGetExtensionsStringARB");
_wglewGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)glewGetProcAddress((const GLubyte*)"wglGetExtensionsStringEXT");
/* query wgl extension string */
if (_wglewGetExtensionsStringARB == NULL)
if (_wglewGetExtensionsStringEXT == NULL)
start = (const GLubyte*)"";
else
start = (const GLubyte*)_wglewGetExtensionsStringEXT();
else
start = (const GLubyte*)_wglewGetExtensionsStringARB(wglGetCurrentDC());
end = start + _glewStrLen(start);
/* initialize extensions */
crippled = _wglewGetExtensionsStringARB == NULL && _wglewGetExtensionsStringEXT == NULL;